Seasonic FOCUS PLUS Gold 550W Power Supply Review

Small computer power supplies that are entirely modular are the cornerstone of Seasonic's Focus Plus series. We are reviewing the Gold variant today rated at 550 watts that has a modern design and with hybrid silent fan control with a fluid dynamic bearing fan. Is the smallest PSU in the Focus Plus series making the cut?

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Overview

The first thing we are going to look at with the FOCUS PLUS Gold 550W is the packaging, accessories, and documentation. While normally none of these items is a make or break item for a power supply the packaging quite often contains a lot of information about the product we are purchasing. The inclusion of an owner’s manual that provides actual information about our product is also of great help. Accessories are almost unnecessary with a power supply as the unit is self contained, unless it is modular, but there are cases where a manufacturer can include useful accessories to make installation, routing, and use more efficient.

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The packaging of the FOCUS PLUS Gold 550W looks just like what we have seen from all of the previous FOCUS PLUS units we have reviewed. As such, the packaging is once more bold and striking with its presentation. The front of the packaging features a large black triangle and then a burst of gold that fades across the packaging in multiple directions. When we start looking for items of note, the only thing of note that we find on the front of the packaging is the 80 Plus seal once more today. A quick check of the 80 Plus website shows that this unit is indeed certified for 80 Plus Gold levels of efficiency (how it actually performs is something we will see shortly). When we flip to the rear of the packaging, we again find a bunch of advertising about today's unit including voltage regulation, efficiency, topology, fan design, etc. We also find a 10 year warranty listed here as was the case with the most recent FOCUS PLUS units we have seen. This is a particularly long warranty given that these FOCUS PLUS units are not flagship products. Moving on to the sides of the packaging, we find the power label (reproduced below), the connector count (reproduced below), and finally a picture of the unit.

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Today's FOCUS PLUS Gold 550W power and connector distributions are identical to that of the FOCUS PLUS Platinum 550W. The 12v rail capacity is up to 45A (or ~98% of the unit's capacity) if necessary. The minor rails (5v and 3.3v) each have a capacity of 20A and the combined capacity of those two rails is 100W. Combined with these outputs, we find that each unit has 2 PCIe connectors, 6 SATA connectors, and 3 Molex connectors. From a connectivity standpoint, this unit seems to be on par with what we would expect from mid-range power supplies similar to those with which this unit competes just like what we saw with the FOCUS PLUS Platinum 550W.

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Once we open the FOCUS PLUS Gold 550W packaging, we are left looking at the power supply itself, a power cord, some screws, the modular cables in a pouch, some zip-ties, some Velcro straps, and the user manual. The user manual is 12 pages long in 12 languages and it is the same manual that we have seen with all of the previous FOCUS PLUS units that we have reviewed. So, all you get are the installation instructions and a tiny troubleshooting section which is not great at all. Let's move on to look at this unit by itself now.